Most (all?) projectors do not contain a tuner inside of them. You'll need an ATSC tuner (assuming you're in the USA, which based on your stations listed I would guess that you are) to convert the digital OTA broadcasts into a video signal suitable for your PJ. You'll also likely want to hook the tuner's audio output to a receiver so you get sound with the picture
Many tuners exist, and I don't know much about them. You'll first want to decide if you want one that can also timeshift (record) programs or not. If you want recording capability, you should strongly consider the TiVo HD or their newer, bigger HDXL as they have dual ATSC tuners. If not, I think HDTV Technical
forum is the right one to look for ATSC HD tuners but I could be wrong - I use cable and a TiVo S3 (similar to TiVo HD) for my PJ.